fixup! Update docs/testing_and_debugging.rst

Co-authored-by: Robert Raposa <rraposa@edx.org>

Author: dianakhuang

docs/testing_and_debugging.rst

@@ -71,7 +71,7 @@ Custom Logging Testing
 
 If you would like to test modifications to the docker logging configuration as
 listed in the custom-created `public-dockerfiles logging configuration`_, the ``docker-production.py``
-won't exist in devstack due to the local edx-platform copy being mounted as a volume over it.
+file won't exist in devstack due to the local edx-platform copy being mounted as a volume over it.
 
 Any changes will need to be copied over into ``/py_configuration_files/{lms,cms}.py`` to be tested
 on devstack.